This part of ISO 8536 applies to sterilized accessories for single use in fluid lines and pressure infusion equipment as specified in ISO 8536-8. This part of ISO 8536 includes: a) Two-way stopcocks (2SC), three-way stopcocks (3SC), four-way stopcocks (4SC) and stopcocks manifold (SM); NOTE Designation of a stopcock depends on the number of connections. The number of possible functional positions can be expressed by addition of a complementary note, using a diagonal stroke and a numeral indicating the number of possible stopcock positions, e.g. 3/4-way stopcock for three-way stopcock with four possible positions. b) units with injection site (UIS) or check valve (UCV); c) stoppers (S) or adapters (A).